package org.example.codec;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.protobuf.ProtobufEncoder;

import java.net.InetSocketAddress;

/**
 * @author xuan
 * @create 2023/9/19
 */
public class Client {
    public static void main(String[] args) {
        //客户端需要一个事件循环组
        EventLoopGroup eventExecutors=new NioEventLoopGroup();

        try {
            //创建客户端启动对象
            Bootstrap bootstrap=new Bootstrap();

            //设置相关参数
            bootstrap.group(eventExecutors) //设置线程组
                    .channel(NioSocketChannel.class) //设置客户端通道的实现类（反射）
                    .handler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            ChannelPipeline pipeline = ch.pipeline();

                            //加入编码器
                            pipeline.addLast("encoder", new ProtobufEncoder());
                            pipeline.addLast(new ClientHandler());     //加入自己的处理器
                        }
                    });
            System.out.println("客户端 ok...");

            //启动客户端去连接服务器端
            //关于ChannelFuture要分析，涉及到netty的异步模型
            ChannelFuture channelFuture = bootstrap.connect(new InetSocketAddress("127.0.0.1", 8080)).sync();

            //关闭通道进行监听
            channelFuture.channel().closeFuture().sync();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }finally {
            eventExecutors.shutdownGracefully();
        }
    }
}
